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烟粉虱Bemisia tabaci(Gennadius)是重要的世界性害虫之一,对农业生产造成了严重的危害。利用天敌对烟粉虱进行生物防治已经成为研究重点。本文于2007年6月至2008年11月对宁波地区不同寄主作物上烟粉虱虫口数量及其寄生蜂种类进行了调查。结果查得烟粉虱寄生蜂共7种,它们是恩蚜小蜂属Encarsia Forster的浅黄恩蚜小蜂En.sophia、日本恩蚜小蜂En.japonica、丽蚜小蜂En.formosa、黄盾恩蚜小蜂En.smithi和桨角蚜小蜂属Er-etmocerus Haldeman的蒙氏桨角蚜小蜂Er.mundus、狄氏桨角蚜小蜂Er.debachi、盾黑桨角蚜小蜂Er.melanoscutus,其中优势种为浅黄恩蚜小蜂En.sophia、蒙氏桨角蚜小蜂Er.mundus和狄氏桨角蚜小蜂Er.debachi,这3种寄生蜂分别占收集到寄生蜂总数量的35.89%、49.66%和11.01%;此外,田间十字花科蔬菜上的烟粉虱虫口数量最高峰在2007年12月,自然寄生率最高峰在2008年10月,寄生率可达到13.86%;田间黄瓜上的烟粉虱虫口数量最高峰出现在2007年11月,自然寄生率最高峰在2007年8月,寄生率可达到8.22%;田间茄子上的烟粉虱虫口数量高峰出现在2007年7月和9月及2008年10月,自然寄生率高峰出现在2007年7月和9月及2008年9月,分别达到13.25%,10.30%和5.92%。
Bemisia tabaci (Gennadius) is one of the important worldwide pests and causes serious damage to agricultural production. Biological control of Bemisia tabaci using natural enemies has become a research focus. In this paper, from June 2007 to November 2008, the population of Bemisia tabaci on different host crops in Ningbo and their parasitoid species were investigated. Results There were 7 parasitic wasps in Bemisia tabaci, which were En.sophia, En.ophilus, En.formosa, Encounter Forster, En.formosa, Envirginidae En.smithi and Aphis gossypii Ermian Er-etmocerus Haldeman’s Aphis gossypii Ermundus, Erysiphon spp. melanoscutus, in which the dominant species were En.sophia, Ermundus, and Er.debachi, the dominant parasitoids were collected respectively 35.89%, 49.66% and 11.01% respectively. In addition, the highest peak of population of B. tabaci on field cruciferous vegetables was in December 2007, the highest natural parasitism rate was in October 2008, and the parasitism rate could reach 13.86%. The highest peak of population of B. tabaci on field cucumbers appeared in November 2007, the highest natural parasitism rate was 8.22% in August 2007; the peak of population of B. tabaci on field eggplant appeared in 2007 In July and September and October 2008, the peak of natural parasitism occurred in July and September 2007 and September 2008, reaching 13.25%, 10.30% and 5.9% respectively 2%.